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(N0 M0681.) 2 Sheets-Sheet 1.

- J. K. GRIFFIN.

ORB PULVERIZER. No. 318,181. Patented May19,1885.

(No Model.) 2 Sheets-Sheet 2. J. K. GRIFFIN.

ORE PULVERIZER.

' I UNITED STATES PATENT OFFICE.

JAMES E: GRIFFIN, OF BROOKLYN, NEW YORK, ASSIGN OR TO. THE GRIFFINMANUFACTURING COMPANY.

ORE-PULVERIZER.

SPECIFICATION forming part of Letters Patent No. 318,181, dated May 19,1885.

Application filed March 19, 1885. (No model.)

.To all whom it may concern:

Be it known that I, JAMES K. GRIFFIN, a citizen of the Dominion ofCanada, and residing at Brooklyn,'in the county of Kings and State ofNew York, have invented certain new and useful Improvements inOre-Pulverizers,

of which the following is a specification, reference being had to theaccompanying drawlngs.

My invention relates to mechanism for the reduction of ores and othersubstances by attrition, and for-the removal of the reduced materialfrom the line of attrition as fast as it is sufficiently ground, byacurrent of air directed through alternate passages of a central conveyerdirectly upon the line of attrition between opposing surfaces of thesubstance, as will be hereinafter more fully described, and pointed outin the claims.

In the drawings, Figure 1 represents a front elevation of the machine.Fig. 2 represents a longitudinal vertical section of the same. (Thesection of the shell is taken on the line 00 m, Fig. 3.) Fig.3'represents a top plan of the shell and connections, partly sectional.

The letter a indicates a shell or case made preferably of upper andlower sections bolted together at the peripheral edges and forming aclose tight-bottomed receptacle. It is made open at the top and revolvesas closely as may be beneath the cap-plate or cover I). This cover isbolted to the machine-frame, and is provided with openings for thepassage of the material to and from the machine, as hereinafterdescribed.

Within the shell or case a is a rotating conj which alternate with thepassages g g, are each veyer, e, which is fast on a shaft, f. This shaftis journaled in bearings in a tubular shaft or sleeve, (1, and in alower step bearing on the frame. A bevel gear-wheel, c, is fast on thesleeve d, and a bevel gear-wheel, c, is fast on the shaft f, so thatsuitable gears on a drivingshaft may mesh with gears c c for rotatingthe shell a and the conveyer 6 independently of each other. Preferablythe gearing is so arranged that the shell a shall have twice therotative speed of the conveyer e, and so that the shell and conveyerrotatesimultaneously. in opposite directions. The rotative speed of theshell and conveyer, respectively, may be va- 5o ried to suit therequirements of different classes of material, and effective resultshave been obtained by rotating the shell and con veyer in the samedirection, when the speed of the shell considerably exceeds that of theconveyer; 'or the conveyer may remain stationary, the shell rotatingaround it, as hereinafter described. The conveyer e is dividedvertically and radially, preferably into four passages, arranged inopposite pairs,two opposite passages, g 9, being arranged so as toconnect with the central passage, 2', which opens into the hopper h toconduct therefrom the crude substance down to the outlets of thepassages These outlets face the inner periphery 1 of the shell a, andhave, preferably, a rectangular form and a marginal contour conforminghorizontally to the curve of the shell. The edges of the outlets of thepassages gg may be formed of separate adjustable plates 9, connected byadjustable end plates, 9 and movable outwardly from the center inparallel grooves, in

which they are firmly held by wedgingrkeys g crowded against the endplates'and secured by bindingscrews 9, (shown by dotted lines,) 7 5passing through the key.

In the construction of machines for different purposes the space betweenthe outlets and the inside of the shell may be varied ac cording to thequality of the material to be compacted or consolidated therein, as somesubstances require more space than others for the formation of a firmannular wall, as here inafter described.

The compartments 7c is of the conveyer e,

divided centrally and horizontally by a plate,

m, so that the space under it connects with the passages 12 p, and thespace above it with the exhaust-pipe 0 to provide a passage around theplate m for a current of air, which may be forced by an air-blower orother suitable de vice.

The relative proportions of the various parts of the machine are variedto suit the size and quality of the material to be reduced, and may beof other suitable form, as preferred.

the greater rotative velocity of the shell gives- In operation the crudesubstance is supplied from the hopper it through the opening 2' into thepassages g of the rotating conveyer, and discharged therefrom bycentrifugal force against the opposite inner surface of the rotatingshell a, but without grinding effect until the shell is filled to theedges of the outlets g, meanwhile the centrifugal force developed by therotation of the shell packs the material received from the conveyer einto an annular solid wall of sufficient firmness to resist the massesforced against and ground upon it. The whole body of this annular wallneed not necessarily be of the material to be reduced. As the rotationof the shell and conveyer continues the greater solidity of the annularwall due to it a resisting power sufficient to pack the material forcedagainst it, so that the firm bodies of material in the shell andconveyer,respect ively, rotating in opposite directions, are

solidly ground against each other on a well-defined line of attritionoutside of and off from the periphery of the conveyer and within thematerial. The greater the excess of rotating speed in the shell over theconveyer the more compact and solid will the respective bodies in theshell and conveyer be. For some material it is better not to rotate theconveyer, the attrition between the mass in the conveyer pressingdownward by it own weight and out against the firm rotating annular wallin the shell, being sufficient for the reduction de sired. This iseffected by loosening the gearwheel from the shaft f and dropping it outof connection with the driving-wheel upon the step, as shown by dottedlines. The solid impact and grinding of the material practicallyexcludes the air from the line of attrition while the grinding takesplace, thereby facilitating the reducing process. As the work ofreduction progresses a current of air forced downward through passages pand under plates m immediately against the annular wall at its exposedsurface between the passages 5 acts as an air-brush, and by a rotatingor whirling motion sweeps the reduced material clean from the surface ofthe annular wall, directly in the line of attrition, as fast as thereduction takes place, leaving the clean, sharp, and unclogged surfacesof compact crude material to grind against each other, while thepowdered product is carried off by the same current over plates m upwardthrough the exhaust-pipe o to any suitable settler or reception-chamber.The current of air may be changed or reversed and the reduced productcarried off in any other suitable upward or downward direction throughor outside of the conveyer, as at the ports 12 c in the shell, so longas the air is separately conducted directly to and upon the line ofattrition. The force of the current of air is adjusted to and determinesthe grade of fineness in the productthe lighter the draft the finer theproduct, and vice versa. This is due to the fact that if the current ofair is strong it takes up heavier and larger particles than when thecurrent is weak, whereas if the current is weak the particles will beground over and over again till fine enough to be lifted by the lighterdraft.

I have demonstrated bycontinued use that with the shell and conveyerrotating in opposite directions at low speed, not exceeding from onehundred and fifty to two hundred revolutions per minute, very hardsubstancesas quartz and phosphate rockcan by my machine be pulverized insatisfactory quantities to the finest or impalpable powder with outintermixture of foreign substances or 1njury to the machine.

I do not herein claim the method or process of reducing ores by themechanism herein described,- as on August 14, 1884:, I filed anapplication, Serial No.140,4:91, for said method or process,illustrating as a part thereof substantially the same mechanism hereinillustrated and described.

This application is intended to be a division of the former application.

Having thus described my invention,what I claim as new, and desire tosecure by Letters Patent, is

1. In an ore-pulverizer, a horizontally-arranged conveyer having two ormore distinct openings for the passage of the material to be reduced andfor the air to carry off the same when pulverized, substantially asdescribed.

2. In an ore-pulverizer, the combination of the conveyer having openingsfor the passage of the material to be reduced and for the air to carryoff the same when pulverized, an outer rotating shell or case, and meansfor rotating the latter, substantially as described.

3. In an ore-pulverizer, the combination of a revolving conveyer havingopenings for the passage of the material to be reduced and for the airto carry off the same when pulverized, an outer rotating shell or case,and means for rotating both the conveyer and the shell, substantially asdescribed.

4. In an ore-pulverizer, the combination of a conveyer having ore andair passages, and an outer rotating shell or case, said conveyer andshell being so adapted that the ore delivered through the conveyer willform with the ore adhering to the shell a line of attrition on theiropposing surfaces, and means for rotating the shell, substantially asdescribed.

5. In an ore-pulverizer, the combination of a rotating conveyer havingore and air passages, and an outer rotating shell or case, said conveyerand shell. being so adapted that the ore delivered through the conveyerwill form with the ore adhering to the shell a line of attrition ontheir opposing surfaces, and means for rotating both the conveyer andshell, substantially as described.

6. In an ore-.pulverizer, the combination of an inner rotating conveyer,an outer rotating shell, independent means for rotating the con- ICCveyer and the shell, and a hopper, constructed In testimony whereof Iaffix my signature in and arranged substantially as described. presenceof two witnesses.

7. An ore-pulverizer comprising the conveyer 6, having ore-passages g g,air-passages JAMES K. GRIFFIN.

5 p p, cap 12, adjustable plates 9 g, divisionplates m m, shell (1,shafts d and f, gearing C, Witnesses:

and adjustable gearing 0, all constructed and CHARLES S. HYER, yr}arranged substantially as described. RUssELL H. SCOTT.

